Fire extinguisher inspection and documentation requirements: OSHA guide

Last updated 2026-07-10

What does OSHA actually require for fire extinguisher inspections?

The governing standard is 29 CFR 1910.157, OSHA's portable fire extinguisher rule for general industry. It has three inspection layers. Each one has a different frequency, a different performer, and a different documentation rule.

First: a visual inspection at least once a month ^[1]. OSHA calls it an "inspection," but the standard doesn't say who has to do it and doesn't require a written record at the federal level. Most employers hand it to a supervisor or safety officer who walks the floor and checks that each extinguisher is in its spot, the pressure gauge reads in the green, the pin is intact, and there's no visible damage. That's the whole job. Two minutes per unit.

Second: an annual inspection by a "trained person" ^[1]. This one has teeth. The inspector checks the cylinder, the hose and nozzle, the discharge mechanism, and whether the label is still readable. This inspection does require a written record, kept at least one year past the inspection date.

Third: a 6-year internal examination and a 12-year hydrostatic test for stored-pressure extinguishers ^[1]. These go past a visual look. A qualified service company empties the agent, inspects the internal parts, and recharges the unit. The date and the company go on a tag attached to the extinguisher and into your maintenance records.

One point trips people up. 1910.157 applies to workplaces where employees are expected to use extinguishers to fight fires. If you have a written policy that everyone evacuates and nobody fights fires, you're technically off the hook for the full training and use rules in 1910.157(g). The inspection and maintenance rules in 1910.157(e) still apply. The extinguishers still have to be there, they still have to work, and you still have to check them ^[2].

How often do fire extinguishers need to be inspected under OSHA?

Monthly at minimum, annually by a trained inspector, and every 6 years for internal maintenance. That's the whole schedule in one breath.

Here it is laid out:

Inspection Type	Frequency	Who Performs It	Written Record Required by OSHA?
Visual check	Monthly	Any designated employee	No (but many state/local codes do require it)
Annual inspection	Yearly	Trained person	Yes, kept 1 year
Internal examination	Every 6 years	Qualified service company	Yes, tag on unit + maintenance file
Hydrostatic test	Every 12 years (most types)	Certified hydrostatic test facility	Yes, tag on unit

The 12-year hydrostatic interval covers most stored-pressure dry chemical extinguishers. CO2 and some other types run on different intervals spelled out in NFPA 10, which OSHA references as the accepted industry standard ^[3]. If you run more than one location, a spreadsheet with unit serial numbers and due dates for each tier is the floor. Anything less and something slips.

State plan states sometimes stack rules on top of the federal ones. California incorporates NFPA 10 by reference in its Title 8 regulations, which turns the monthly visual check into a required tag or log entry ^[4]. If you're in a state plan state, read your state's fire code before you assume the federal minimum is enough.

What records do you have to keep for fire extinguisher inspections?

Federal OSHA under 1910.157(e)(3) requires an annual inspection record with two things at minimum: the date of the inspection and the initials or signature of the person who did it ^[1]. No specific form is mandated. A three-ring binder with a sign-off sheet, a shared spreadsheet, or a digital maintenance log all work, as long as those two data points land for every unit.

Here's what a useful record actually holds:

• Unit identifier (serial number or location tag)
• Date of inspection
• Name and signature of the inspector
• Condition notes (pass/fail, any deficiencies found)
• Corrective action taken if a problem showed up
• Date the unit went back into service after any repair

Retention is one year from the inspection date, per 1910.157(e)(3) ^[1]. So you only need the most recent annual inspection on file. Keeping two or three years back costs nothing and gives you a paper trail if a unit ever gets pulled into a fire or injury claim.

For the 6-year internal examination and the 12-year hydrostatic test, the record is usually the tag itself, punched or labeled with the year and attached to the extinguisher, plus a matching entry in your maintenance file. NFPA 10 (2022 edition), the standard OSHA cites for maintenance procedures, calls for a label showing the month and year of the last service ^[3].

Monthly visual checks need no written record under federal OSHA. Make one anyway. A simple initialed checklist on a clipboard near the extinguisher takes 20 seconds and, in a worst case, shows the compliance officer you were doing the work. If you're building a written safety program, written safety programs for fire protection usually fold in a monthly inspection log template for exactly this reason.

Who is qualified to do an annual fire extinguisher inspection?

OSHA uses the phrase "trained person" in 1910.157(e)(3) and never defines a specific credential ^[1]. That's looser than it sounds. It means someone who knows what to look for: pressure levels, the physical condition of the cylinder and nozzle, the pin and tamper seal, the readability of the operating label, and whether the unit matches the hazards in that area.

For most small businesses, an in-house employee trained through a vendor seminar or a recognized fire safety course meets the OSHA standard for the annual inspection. You do not have to hire an outside contractor for it. You do have to hire a qualified service company for the 6-year internal examination and the hydrostatic test, because those mean taking the unit apart and pressurizing the cylinder to its limits, which nobody should attempt without the right equipment and training.

NFPA 10 draws a sharper line between "inspection" and "maintenance" ^[3]. It defines maintenance as the thorough examination and repair done at the 6-year and 12-year intervals, and it says maintenance has to be done by a "trained and qualified" person. Fire marshals and state inspectors lean on NFPA 10 even when OSHA is the enforcement agency for the workplace, so matching NFPA's language pays off.

So: for the monthly check, any employee. For the annual inspection, a trained in-house person is fine under federal OSHA. For internal maintenance and hydrostatic testing, use a licensed fire equipment service company.

What are the most common OSHA violations for fire extinguisher inspections?

Fire extinguisher citations show up on OSHA's frequently-cited list every year, and 29 CFR 1910.157 sits among the most-cited general industry standards ^[5]. The violations fall into a handful of repeating buckets.

Missing or outdated inspection tags. The annual tag (or your log) is expired or gone. This is the most common one. A compliance officer can read the tag on the wall in about three seconds during a walkthrough.

Extinguishers you can't get to. Units blocked by equipment, buried behind boxes, or locked in rooms employees can't reach in an emergency. OSHA requires extinguishers to be readily accessible and visible ^[1]. If an employee has to move a pallet to reach one, that's a violation.

Wrong type for the hazard. A Class A water extinguisher next to an electrical panel or a fryer. Matching extinguisher type to hazard class is part of the placement requirement under 1910.157(d).

No annual record. The inspection got done (probably), but nobody wrote anything down. The unit can be flawless and it's still a violation.

Hydrostatic test overdue. An old unit still on the wall with no evidence of a 12-year test. A 2000-model extinguisher with no sign of a 2012 test is an easy citation.

Penalties scale with severity. As of 2025, OSHA's maximum for a serious violation is $16,550 per violation, and willful or repeated violations reach $165,514 ^[6]. A shop with 12 extinguishers and no current annual records could, in theory, face 12 separate violations. OSHA usually groups them. Grouping doesn't make them cheap.

Does OSHA require a specific form or tag for fire extinguisher inspection records?

No. OSHA's 1910.157(e)(3) only requires that the record show the date and the inspector's initials ^[1]. You can meet it with any of these:

• A paper log in a binder
• An initialed tag on the extinguisher itself (punched month/year tabs are the most common)
• A digital record in a spreadsheet or safety management software
• A third-party service company's inspection report on file

Most fire extinguisher service companies hang a tag on the unit showing the service date and the technician. That tag plus your own monthly check log is more than enough for an OSHA inspection.

NFPA 10 asks that the tag stay on the extinguisher and show the month and year of the last maintenance, the name of the person who did it, and any hydrostatic test dates ^[3]. Following NFPA 10's tag format is smart, because fire marshals use that standard and OSHA compliance officers often reference it.

Want this built into a bigger program? SafetyFolio's safety program generator includes a fire protection module with inspection log templates already formatted to capture what OSHA requires, which beats building one from scratch.

How far apart do fire extinguishers need to be placed, and does that affect inspections?

Placement rules live in 1910.157(d), and they shape how you organize your inspection program, because every unit in the building has to be tracked ^[1].

For Class A hazards (ordinary combustibles like wood, paper, cloth), the maximum travel distance to reach an extinguisher is 75 feet. For Class B hazards (flammable liquids), it depends on the extinguisher's rating, but the general rule is a maximum of 50 feet. For Class C hazards (energized electrical equipment), you use the same placement as A or B depending on the underlying fuel, since Class C is about the non-conductive agent, not a separate placement standard.

In practice, a 5,000 square foot warehouse might need four or five extinguishers to hit the 75-foot rule. Every one of those units has to appear in your monthly and annual records. On your first inventory, walk the floor with a tape measure (or use your square footage and a layout sketch) and number each extinguisher. Put the matching number on your log. This sounds obvious, but the most common recordkeeping gap is a log listing three extinguishers in a building that has five.

Kitchens and any spot with commercial cooking equipment need a Class K extinguisher and its own inspection record. Don't assume the dry chemical unit in the hallway covers the kitchen hood.

What's the difference between an inspection, a maintenance check, and a hydrostatic test?

OSHA and NFPA 10 use these three terms to mean three different things, and confusing them opens compliance gaps.

Inspection (monthly and annual): A visual and operational check with no disassembly. You confirm the unit is in its spot, the pressure is right, the seals and pins are intact, and nothing is physically damaged. The monthly check is quick. The annual is more thorough but still external.

Maintenance (6-year internal examination): The unit comes out of service, gets fully discharged, and gets inspected inside for corrosion, agent contamination, and worn seals and o-rings. The agent is replaced or recharged. This takes a qualified service company and produces a tag and a maintenance record ^[3].

Hydrostatic testing (every 12 years for most types): The cylinder itself gets pressure-tested to confirm it can safely hold its rated pressure. This needs special equipment at a certified facility. A cylinder that fails is condemned and pulled from service. The test date gets stamped or labeled on the cylinder.

The difference matters because the money differs a lot. Monthly inspections cost employee time and nothing else. In-house annual inspections cost a few minutes per unit. A 6-year service from a vendor typically runs $20 to $50 per unit depending on size and type (prices vary by region and market). Hydrostatic testing often runs $30 to $75 per unit, and if the cylinder fails, you're buying a new extinguisher, which runs $50 to $300 or more depending on type ^[7].

For a small business with 10 extinguishers, the 12-year cost of compliance is modest. The bigger risk is skipping it and having a unit fail to discharge in a real fire, or eating a citation during an OSHA inspection.

Do OSHA's fire extinguisher rules apply to construction sites?

Construction runs under a separate standard: 29 CFR 1926.150, the fire protection rule for construction ^[8]. The inspection and maintenance requirements mirror 1910.157 in shape but fit the construction environment.

Under 1926.150, extinguishers on construction sites have to be inspected at least monthly and after each use. Defective or exhausted units come off the wall right away. The standard points to NFPA 10 for maintenance and testing intervals, same as the general industry rule.

One real difference in construction: extinguishers move. A unit sitting in a work area on Monday might be 200 feet away by Friday as the job progresses. Tie your inspection log to serial numbers, not locations. When an extinguisher moves, the record follows the unit, not the spot on the wall.

For workers trying to see where fire safety fits into a construction safety program, OSHA training requirements for construction sites often cover extinguisher use as part of site orientation.

What happens when an extinguisher is used or found to be discharged during a monthly check?

Any extinguisher that's been used, even a little, has to come off the wall and get recharged or replaced before it goes back ^[1]. This is a hard requirement, not a suggestion. A partly discharged unit can still show pressure on the gauge and still fail to deliver its full rated discharge when you need it.

Find a partly or fully discharged unit during a monthly check? Here's the sequence:

1. Remove the unit from its location immediately. 2. Note the finding in your log with the date and your initials. 3. Drop a temporary replacement in that spot if you have one (keep at least one spare on hand for exactly this). 4. Send the unit to your fire equipment vendor for recharge. 5. Log the date it returns to service.

A discharged unit found during an OSHA inspection that hasn't been tagged out or replaced is a clean violation. "Someone must have used it and put it back" is not a defense. The monthly program exists to catch this before OSHA does.

If you run a hazard communication program, note that some extinguishing agents (dry chemical, CO2) carry their own handling and disposal considerations, and your SDS files should reflect the agents used in your facility.

How do you build a fire extinguisher inspection program from scratch?

Start with an inventory. Walk every square foot of your facility and log every extinguisher: location, unit or serial number, type, rated capacity, and the date on the most recent inspection tag. Tag missing or expired? That unit needs annual service now.

Then build a three-tier schedule.

Monthly checks: Assign one person per location or area to do the walk. Hand them a checklist with the extinguisher ID, the date, and five checkboxes (present, gauge in green, pin intact, no damage, label legible). File the sheets in a binder or drop them on a shared drive. Two minutes per unit.

Annual inspections: Either train your maintenance supervisor to do them and document the results, or contract a fire equipment company for a yearly service visit. Going in-house means your person needs documented training. Put the annual inspection on your operations calendar like any other deadline.

6-year and 12-year service: Calendar these now. Pull the tags, note the last service date, and calculate each due date. A unit bought in 2019 and internally serviced at purchase needs its 6-year maintenance in 2025 and its hydrostatic test in 2031. Tracked, they never surprise you.

Want to fold this into a full written fire protection program instead of babysitting a standalone checklist? The kind of program generator at SafetyFolio walks you through the written program in a structured format, extinguisher inspections included.

Last, train your people. 29 CFR 1910.157(g) requires that employees expected to use extinguishers get hands-on training on hire and every year after ^[1]. If your policy is evacuation-only, put that in writing so the (g) training requirement drops away. The (e) inspection requirements stay. Knowing the full scope of OSHA compliance for your workplace is the only way to know which rules you actually answer to.

Frequently asked questions

Does OSHA require a monthly fire extinguisher inspection log?

Federal OSHA does not require a written log for monthly visual inspections under 29 CFR 1910.157. The standard requires the monthly inspection but specifies written records only for the annual inspection. Many state plans and local fire codes do require monthly documentation. Keeping a simple initialed tag or checklist is good practice regardless, because it shows due diligence if OSHA or a fire marshal ever questions your compliance.

How long do I have to keep fire extinguisher inspection records?

OSHA's 29 CFR 1910.157(e)(3) requires annual inspection records to be kept for one year from the inspection date. The standard sets no longer retention period. In practice, keeping two to three years of records costs nothing and gives you a paper trail if a unit gets pulled into an injury or property loss claim. Keep 6-year internal examination and hydrostatic test records at least until the next service interval.

What type of fire extinguisher is required in a commercial kitchen?

Commercial kitchens require a Class K extinguisher for cooking surfaces and deep fryers. Class K agents are built for high-temperature cooking oils and fats. You still need Class ABC or appropriate extinguishers for the rest of the building. A Class K unit has its own inspection and service schedule under NFPA 10 and must appear separately in your inspection records.

Can an employee do the annual fire extinguisher inspection, or does it have to be a licensed company?

Under federal OSHA's 29 CFR 1910.157, the annual inspection only requires a "trained person," which can be an in-house employee who has received appropriate training. A licensed fire equipment company is required only for the 6-year internal maintenance examination and the 12-year hydrostatic test, not for the annual visual and operational inspection. Document your employee's training so you can show their qualifications if questioned.

What is the OSHA fine for not having fire extinguisher inspections?

OSHA can cite violations of 29 CFR 1910.157 as serious, which carry a maximum penalty of $16,550 per violation as of 2025. Willful or repeated violations can reach $165,514 per violation. In practice, compliance officers often group multiple extinguisher violations into fewer citations, but each unit with a missing or expired annual inspection record is a potential separate violation.

Do portable fire extinguisher rules apply to small businesses with fewer than 10 employees?

Yes. OSHA's 29 CFR 1910.157 has no employee-count exemption. Any general industry employer covered by OSHA who provides portable fire extinguishers for employee use must meet the inspection and maintenance requirements, no matter the company size. The only relevant exception is a documented policy that all employees evacuate and no one fights fires, and even then the inspection and maintenance requirements for any extinguishers on site still apply.

How do I know when a fire extinguisher needs its hydrostatic test?

Check the service tag or stamped label on the cylinder for the date of the last hydrostatic test. For most stored-pressure dry chemical extinguishers, the interval is every 12 years. CO2 extinguishers get tested every 5 years. NFPA 10 lists test intervals by extinguisher type. If there's no record of a hydrostatic test and the unit is more than 12 years old, test it or replace it before keeping it in service.

What should I check during a monthly fire extinguisher inspection?

A monthly visual check confirms the unit is in its designated location, the pressure gauge sits in the green (operational range), the tamper seal and safety pin are intact, there's no visible damage to the cylinder, hose, or nozzle, and the operating label is legible. The check takes two to three minutes per unit. Log the date and your initials even though federal OSHA doesn't require a written monthly record, because many state and local codes do.

Are there different fire extinguisher inspection rules for construction sites?

Yes. Construction sites fall under 29 CFR 1926.150 rather than 1910.157. The construction standard requires inspection at least monthly and after each use. Maintenance and testing follow NFPA 10 intervals, the same reference as general industry. One practical difference: extinguishers move frequently on construction sites, so tracking by serial number rather than fixed location keeps records accurate.

What happens if a fire extinguisher fails its hydrostatic test?

A cylinder that fails hydrostatic testing is condemned and must be permanently removed from service. It can't be repaired and returned to use. You'll need to buy a replacement. The failed unit should be rendered inoperable before disposal so it can't be mistakenly returned to service. Budget for replacement when you schedule hydrostatic tests, especially for older units.

Does OSHA require employees to be trained on fire extinguisher use?

Yes, if employees are expected to use extinguishers. Under 29 CFR 1910.157(g), employers must provide training upon initial assignment and annually after that for employees designated to use portable fire extinguishers. If your written policy directs all employees to evacuate and prohibits fire fighting, the (g) training requirement doesn't apply. The inspection and maintenance requirements in 1910.157(e) apply regardless of your evacuation policy.

How many fire extinguishers does OSHA require for a given building size?

OSHA doesn't set a number by square footage directly. Instead, 29 CFR 1910.157(d) requires extinguishers to be distributed so no employee travels more than 75 feet to reach one for Class A hazards, and 50 feet for Class B hazards. The practical result is roughly one extinguisher per 3,000 to 11,250 square feet depending on hazard class and extinguisher rating, but layout and obstructions affect the actual count.

Can I use a digital inspection log to satisfy OSHA recordkeeping requirements for fire extinguishers?

Yes. OSHA's 1910.157(e)(3) requires only that the date and inspector's initials be recorded. The standard doesn't specify paper. A spreadsheet, a safety management app, or a digital form all satisfy the requirement as long as the records are accessible during an OSHA inspection and retained for at least one year. Make sure your digital records are backed up and can be printed or displayed on demand.

What is a 6-year fire extinguisher maintenance and what does it involve?

Every six years, stored-pressure fire extinguishers require an internal examination under NFPA 10. A qualified service company removes the extinguishing agent, inspects the inside of the cylinder for corrosion or contamination, replaces seals and o-rings, and recharges the unit with fresh agent. The service company attaches a label showing the date and technician. This is separate from the annual inspection, which is external only.

Sources

1. OSHA, 29 CFR 1910.157 Portable Fire Extinguishers: Monthly visual inspection, annual inspection by a trained person, and 6-year internal maintenance requirements; annual records must be kept for one year; employees expected to use extinguishers must be trained upon hire and annually.
2. OSHA, 29 CFR 1910.157(b) Exemptions: Workplaces with a total evacuation policy are exempt from the training and use requirements of 1910.157(g) but the inspection and maintenance requirements of 1910.157(e) still apply to extinguishers on site.
3. NFPA 10: Standard for Portable Fire Extinguishers, 2022 Edition: NFPA 10 defines inspection, maintenance, and hydrostatic test intervals; specifies 6-year internal examination and 12-year hydrostatic test for stored-pressure dry chemical extinguishers; requires service tag with month/year and technician name.
4. California Department of Industrial Relations, Cal/OSHA Title 8 Regulations: California's Title 8 incorporates NFPA 10 by reference, which means monthly inspections require a tag or log entry in that state plan jurisdiction.
5. OSHA, Commonly Used Statistics and Top 10 Most Cited Standards: 29 CFR 1910.157 (portable fire extinguishers) consistently ranks among OSHA's most-cited general industry standards.
6. OSHA, Penalties: As of 2025, OSHA maximum penalty for a serious violation is $16,550; willful or repeated violations can reach $165,514 per violation.
7. NFPA, Portable Fire Extinguishers Safety Information: General cost and service context for portable fire extinguisher maintenance, recharge, and replacement; prices vary by region and market.
8. OSHA, 29 CFR 1926.150 Fire Protection (Construction): Construction sites are governed by 1926.150, which requires monthly extinguisher inspection and inspection after each use; references NFPA 10 for maintenance and testing intervals.
9. OSHA, Fire Safety in the Workplace: OSHA guidance page on general fire safety requirements and extinguisher placement rules for general industry workplaces.
10. Bureau of Labor Statistics, Census of Fatal Occupational Injuries: BLS injury and fatality data used as background for understanding fire-related occupational risks in the workplace context.